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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const arr = [1,2,3,4]
        // const boolen = arr.some(index =>index)
        // console.log(boolen);
        Array.prototype.mySome = function (callback) {
            for (let i = 0; i < this.length; i++) {
                if(callback(this[i],i,this)) {
                    return true
                }
                return false
            }
        }
        const b= arr.mySome(item=> item<3)
        console.log(b);
    </script>
</body>

</html>